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July 24, 1923. 1,462,548

E. R. HOLMES WARP STOP MOTION Filed Jim. 11, 1921 2 Sheets-Sheet lwwxlwm Jul 24, 1923. 1,452,543

Ev R. HOLMES WARP S TOP MOTI ON Filed Jan. 11 1921 2 Sheets-Sheet 2Patented July 24, 1923.

hd dhwd IELBRIDGE R. HOLMES, OF WORCESTER. IKASSACHUSETTS, ASSIGNOR TOCROMPTON & KNOWLES LOOM WORKS, OF WOHCESTER, MASSACHUSETTS, ACORPORATION OF MASSACHUSETTS.

WARP STOP FICTION.

Application filed January 11, 1921.

T all whom it may concern:

Be it known that I, ELBRIDGE R. HOLMES, a citizen of the United States,residing at Worcester, in the county of Worcester and State ofMassachusetts, have invented a new and useful Warp Stop Motion, of whichthe .following is a specification. 4

This invention relates to a warp stop motion and particularly to certainimprovements in a warp stop motion of the type shown in my prior Patent#1,360,638 dated November 30, 1920. Under certain conditions the deviceshown in my prior patent is found not entirely satisfactory, as the loomis sometimes stopped a second time and unnecessarily when started aftera warp break has been repaired.

It is the obi ect of my invention to provide certain improvements inwarp stop mechanism of this general type whereby this unnecessarystopping of the loom may be avoided.

lVith this object in view, my invention particularly relates to improvedconnections between the knock-off rod and the stop motion pawl, wherebythe rod more effectively controls the position of the pawl after theloom is stopped.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly pointed out inthe appended claims.

A preferred form of my invention is shown in the drawings in which.

Fig. 1 is a side elevation of a loom with my improved stop motionmounted thereon:

Fig. 2 is an enlarged side elevation of parts of the stop motion shownin-Fig. 1, the loom being stopped;

Fig. 3 is a similar sideelevation showing the parts in normal runningposition;

Fig. 4 is a rear elevationof the parts shown in Fig. 3;

Figs. 5 and 6 are side elevations similar to Figs. 3 and 4 andshowingthe parts at dif' ferent stages of the loom stopping operation;-and sFig. 7 is a view of a drop wire adapted for use in my improved stopmotion.

Referring to the drawings, I have shown a loom frame 10 supporting ashipper handle 11 which is connected by a knock-off rod 12 to the warpstop motion to be described. The handle 11 has a pin and slot connection.cam shaft of the loom.

Serial No. 436,427.

to a lever 13 pivoted at 14 to the loom frame and having a springplunger 15 connected thereto. The plunger 15 extends through a bracket16 and is provided with a compression spring 17 which tends to throw theshipper handle 11 to its extreme off position as soon as it is releasedby the knock-0E rod.

My improved stop motion comprises end frames 20 adjustably secured toL-shaped rods 21 which, in turn, are adjustable in eye bars 22 which maybe secured in selected vertical position in blocks 23 on the loom side10. A plurality of drop wires /V are supported by the warp threads,preferably in parallel banks and an oscillating detector rod 24 extendsthrough each bank of drop wires.

The stop motion shown in the drawings is arranged for four banks of dropwires and arms 25, 26, 27 and 28 are secured to the four detecting rods.24. These arms are 7 connected by links 30and the arm 25 isprovidedwith an upward extension 31 to which is pivotally connected a. U-shapedrod or link 32.

An actuator 38 is pivoted on a stud 34 on the stop motion frame 20 andis connected by a link 35 (Fig. .1) to a lever 36 which is regularlyoscillated by a cam 37 on the lower The upper end of theactuator 33 isforked at 38 and is provided with a loosely pivoted cross stud 39through which the upper end of the U- shaped link 32 extends. A collar40 limits downward movement of the link relative to the stud 39 and acoil spring 41 yieldingl resists upward movement of the link. A

collar 42 is provided for adjustment of the spring tension.

The actuator is also provided with 0. depending hook or projection 43adapted to engage a pawl 44 when the latter is in operative position.The pawl 44 is pivoted at 45 on aswinging arm or stand 46,.also looselv"pivoted on the fixed stud-34. The normal end of the knock-off rod 12.The head 53 has a depending projection 54: supporting a pin or stud 55,also positioned to at times engage the pawl plate l9.

Having described the construction of my improved stop motion, I will nowdescribe its method of operation. When the drop wires W are allsupported by their respective warp threads, the detector rods 24oscillate freely in the broad lower portion of the drop wire slots and.at each such oscillation the pin engages the plate 49 and swings thepawl 44 downward, out of the path of the hook 43.

WVhen. however, the oscillation of the rods 24 is prevented by a fallendrop wire, the rods are held in the position shown in Fig. 5, andcontinued. movement of the actuator 33 merely compresses the spring llon the link 32. As the pin 50 is not then moved to the left to engagethe plate 49, the pawl 44 I remains in the path of the hook l3 and i I aengaged thereby as clearly shown in Big- 5. Such engagement pushes theknock-oil rod 12 to the left or toward the front of the loom andreleases the shipper handle whlch "is thereafter moved by the spring 17to full off position.

The excess movement of the shipper handle and knock-off rod is permittedby the provision of the slot 52 in the head 53 of the knock-off rod.During such excess movement the pin 55 in the head 53 engages the plate49 on the pawl 44 and pulls the pawl out of engagement with the hook 43,as

" shown in Fig. 6. The weight of the knockoff rod. acting through theinclined slot 52 against the stud 51 has the effect of a cam to move thearm 46 back to its normal position as shown in Fig. 2, the pawl l i moving under the hook 43. The parts are then in such position that the loommay be started without again engaging the pawl by the hook and stoppingthe loom a second time.

In my prior patent no provision was made for moving the pawl out of thepath of the hook as the loom was stopped and consequently the pawl wasfrequently engaged by the hook on the actuator on its first oscillationafter the loom was started, thus causing a second and unnecessarystopping of the loom.

Having thus described my invention it will be evident that changes andmodifi- 1 cations can be made therein by those skilled in the art withinthe spirit and scope of my invention as set forth in the claims, and Ido not wish to be otherwise limited to the details herein disclosed butwhat I claim is 2. A warp stop motion having, in comhination, apluralityof drop wires, an actuator, a loom stopping mechanism includinga knock-off rod, a device operable to connect said actuator to said rodand movable to operative and inoperative positions, said device beingnormally inoperative and being rendered operative by a fallen drop wire,and means associated with said knock-off rod for restoring said deviceto inoperative position as the loom is stopped.

3. I11 a warp stop motion, a pawl, a pawl actuator, means to regularlyoscillate said actuator, warp controlled means to move said pawl intoand out of the path of said actuator, and loom stopping mechanismactuated through said pawl nd also effective to move said pawl out ofthe path of said actuator as the loom is'stopped.

4:. A warp stop motion having, in combination, a pluralityof drop wires,an actuator, a swinging arm, a pawl pivoted on said arm and movable intoand out of the pathof said actuator, said pawl having a dependingextension, a plurality of oscillating detector rods for said drop wires,a member movable with said rods, a knock-off rod, and a deviceassociated therewith, said member and said device each engaging saiddepending projection of said pawl under certain conditions to move saidpawl to inoperative position.

5. A warp stop motion having, in combination, a plurality of drop wiresarranged in parallel banks, rods for said drop wires, means toyieldingly' oscillate said rods, and loom stopping mechanism controlledby said rods and drop wires, said mechanism including a pawl,means toengage and move said pawl when in operative position, a member movablewith said rod and connections effective to move said pawl to inoperativeposition when said rods are freely movable, a swinging arm on which saidpawl is mounted, a knock-off rod, and a lost motion connection betweensaid rod and arm, said connection including a device'also effective towithdraw said. pawl to inoperative position when the loom is'stopped.

In testimony whereof I have hereunto affixed my signature.

ELBRIDGE R. HGLMES.

